<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        // function fnShow(){
        //     alert("这是一个函数");
        //     console.log("hello");
        // }
        // fnShow();
        function fnSum(iNum1, iNum2){
            var iNum1, iNum2;
            var iResult = iNum1 + iNum2;
            iResult ++
            return iResult
        }
        var iNum = fnSum(10, 20)
        alert(iNum)
        var iScore = 60;
        if (iScore < 60){
            alert("不及格")
        }else if(iScore === 60){
            alert("刚好及格")
        }else{
            alert("优秀")
        }

    </script>
</head>
<body>
    
</body>
</html>